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13d-11d+4d-6d+2d=10
We move all terms to the left:
13d-11d+4d-6d+2d-(10)=0
We add all the numbers together, and all the variables
2d-10=0
We move all terms containing d to the left, all other terms to the right
2d=10
d=10/2
d=5
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